From 43a66b4c417ad15f6d2f632ce67ad195bdf999e8 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Tue, 19 Mar 2013 09:21:25 +0100 Subject: USB: ssu100: fix use-after-free in TIOCMIWAIT Use the port wait queue and make sure to check the serial disconnected flag before accessing private port data after waking up. This is is needed as the private port data (including the wait queue itself) can be gone when waking up after a disconnect. Cc: stable Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ssu100.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'drivers/usb/serial/ssu100.c') diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c index b57cf841c5b6..4b2a19757b4d 100644 --- a/drivers/usb/serial/ssu100.c +++ b/drivers/usb/serial/ssu100.c @@ -61,7 +61,6 @@ struct ssu100_port_private { spinlock_t status_lock; u8 shadowLSR; u8 shadowMSR; - wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */ struct async_icount icount; }; @@ -355,8 +354,9 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) spin_unlock_irqrestore(&priv->status_lock, flags); while (1) { - wait_event_interruptible(priv->delta_msr_wait, - ((priv->icount.rng != prev.rng) || + wait_event_interruptible(port->delta_msr_wait, + (port->serial->disconnected || + (priv->icount.rng != prev.rng) || (priv->icount.dsr != prev.dsr) || (priv->icount.dcd != prev.dcd) || (priv->icount.cts != prev.cts))); @@ -364,6 +364,9 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) if (signal_pending(current)) return -ERESTARTSYS; + if (port->serial->disconnected) + return -EIO; + spin_lock_irqsave(&priv->status_lock, flags); cur = priv->icount; spin_unlock_irqrestore(&priv->status_lock, flags); @@ -445,7 +448,6 @@ static int ssu100_port_probe(struct usb_serial_port *port) return -ENOMEM; spin_lock_init(&priv->status_lock); - init_waitqueue_head(&priv->delta_msr_wait); usb_set_serial_port_data(port, priv); @@ -537,7 +539,7 @@ static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) priv->icount.dcd++; if (msr & UART_MSR_TERI) priv->icount.rng++; - wake_up_interruptible(&priv->delta_msr_wait); + wake_up_interruptible(&port->delta_msr_wait); } } -- cgit v1.2.3 From bf8773c6eacc9c3241455fdb7e82050ad2323a0a Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 21 Mar 2013 12:36:39 +0100 Subject: USB: ssu100: remove explicit initialisation of disconnect The disconnect callback is set to the generic implementation by usb-serial core if NULL. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ssu100.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/usb/serial/ssu100.c') diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c index 4b2a19757b4d..97aca3fce883 100644 --- a/drivers/usb/serial/ssu100.c +++ b/drivers/usb/serial/ssu100.c @@ -641,7 +641,6 @@ static struct usb_serial_driver ssu100_device = { .get_icount = ssu100_get_icount, .ioctl = ssu100_ioctl, .set_termios = ssu100_set_termios, - .disconnect = usb_serial_generic_disconnect, }; static struct usb_serial_driver * const serial_drivers[] = { -- cgit v1.2.3 From 618e183d03a95da200bed48e5277efe428feef26 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 21 Mar 2013 12:36:40 +0100 Subject: USB: ssu100: remove custom close operation The generic close operation will be used if the close field is left uninitialised. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ssu100.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'drivers/usb/serial/ssu100.c') diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c index 97aca3fce883..45b8c29060d1 100644 --- a/drivers/usb/serial/ssu100.c +++ b/drivers/usb/serial/ssu100.c @@ -315,11 +315,6 @@ static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port) return usb_serial_generic_open(tty, port); } -static void ssu100_close(struct usb_serial_port *port) -{ - usb_serial_generic_close(port); -} - static int get_serial_info(struct usb_serial_port *port, struct serial_struct __user *retinfo) { @@ -630,7 +625,6 @@ static struct usb_serial_driver ssu100_device = { .id_table = id_table, .num_ports = 1, .open = ssu100_open, - .close = ssu100_close, .attach = ssu100_attach, .port_probe = ssu100_port_probe, .port_remove = ssu100_port_remove, -- cgit v1.2.3 From 31ecdb6befeab20d93b49b8dd640c081b48912d0 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 21 Mar 2013 12:37:31 +0100 Subject: USB: ssu100: switch to generic get_icount implementation Switch to the generic get_icount implementation. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ssu100.c | 55 +++++++++++++-------------------------------- 1 file changed, 15 insertions(+), 40 deletions(-) (limited to 'drivers/usb/serial/ssu100.c') diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c index 45b8c29060d1..8d94a5a7c4b6 100644 --- a/drivers/usb/serial/ssu100.c +++ b/drivers/usb/serial/ssu100.c @@ -61,7 +61,6 @@ struct ssu100_port_private { spinlock_t status_lock; u8 shadowLSR; u8 shadowMSR; - struct async_icount icount; }; static inline int ssu100_control_msg(struct usb_device *dev, @@ -345,16 +344,16 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) unsigned long flags; spin_lock_irqsave(&priv->status_lock, flags); - prev = priv->icount; + prev = port->icount; spin_unlock_irqrestore(&priv->status_lock, flags); while (1) { wait_event_interruptible(port->delta_msr_wait, (port->serial->disconnected || - (priv->icount.rng != prev.rng) || - (priv->icount.dsr != prev.dsr) || - (priv->icount.dcd != prev.dcd) || - (priv->icount.cts != prev.cts))); + (port->icount.rng != prev.rng) || + (port->icount.dsr != prev.dsr) || + (port->icount.dcd != prev.dcd) || + (port->icount.cts != prev.cts))); if (signal_pending(current)) return -ERESTARTSYS; @@ -363,7 +362,7 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) return -EIO; spin_lock_irqsave(&priv->status_lock, flags); - cur = priv->icount; + cur = port->icount; spin_unlock_irqrestore(&priv->status_lock, flags); if ((prev.rng == cur.rng) && @@ -381,30 +380,6 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) return 0; } -static int ssu100_get_icount(struct tty_struct *tty, - struct serial_icounter_struct *icount) -{ - struct usb_serial_port *port = tty->driver_data; - struct ssu100_port_private *priv = usb_get_serial_port_data(port); - struct async_icount cnow = priv->icount; - - icount->cts = cnow.cts; - icount->dsr = cnow.dsr; - icount->rng = cnow.rng; - icount->dcd = cnow.dcd; - icount->rx = cnow.rx; - icount->tx = cnow.tx; - icount->frame = cnow.frame; - icount->overrun = cnow.overrun; - icount->parity = cnow.parity; - icount->brk = cnow.brk; - icount->buf_overrun = cnow.buf_overrun; - - return 0; -} - - - static int ssu100_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { @@ -527,13 +502,13 @@ static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) if (msr & UART_MSR_ANY_DELTA) { /* update input line counters */ if (msr & UART_MSR_DCTS) - priv->icount.cts++; + port->icount.cts++; if (msr & UART_MSR_DDSR) - priv->icount.dsr++; + port->icount.dsr++; if (msr & UART_MSR_DDCD) - priv->icount.dcd++; + port->icount.dcd++; if (msr & UART_MSR_TERI) - priv->icount.rng++; + port->icount.rng++; wake_up_interruptible(&port->delta_msr_wait); } } @@ -553,22 +528,22 @@ static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr, /* we always want to update icount, but we only want to * update tty_flag for one case */ if (lsr & UART_LSR_BI) { - priv->icount.brk++; + port->icount.brk++; *tty_flag = TTY_BREAK; usb_serial_handle_break(port); } if (lsr & UART_LSR_PE) { - priv->icount.parity++; + port->icount.parity++; if (*tty_flag == TTY_NORMAL) *tty_flag = TTY_PARITY; } if (lsr & UART_LSR_FE) { - priv->icount.frame++; + port->icount.frame++; if (*tty_flag == TTY_NORMAL) *tty_flag = TTY_FRAME; } if (lsr & UART_LSR_OE){ - priv->icount.overrun++; + port->icount.overrun++; if (*tty_flag == TTY_NORMAL) *tty_flag = TTY_OVERRUN; } @@ -632,7 +607,7 @@ static struct usb_serial_driver ssu100_device = { .process_read_urb = ssu100_process_read_urb, .tiocmget = ssu100_tiocmget, .tiocmset = ssu100_tiocmset, - .get_icount = ssu100_get_icount, + .get_icount = usb_serial_generic_get_icount, .ioctl = ssu100_ioctl, .set_termios = ssu100_set_termios, }; -- cgit v1.2.3 From c24c838e8effd55ba330d1966d9846400af4bec8 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 21 Mar 2013 12:37:32 +0100 Subject: USB: ssu100: switch to generic TIOCMIWAIT implementation Switch to the generic TIOCMIWAIT implementation. This also fixes the issue with processes waiting for modem-status-changes not being woken up at disconnect. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ssu100.c | 50 ++------------------------------------------- 1 file changed, 2 insertions(+), 48 deletions(-) (limited to 'drivers/usb/serial/ssu100.c') diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c index 8d94a5a7c4b6..5b62dbbdf996 100644 --- a/drivers/usb/serial/ssu100.c +++ b/drivers/usb/serial/ssu100.c @@ -337,49 +337,6 @@ static int get_serial_info(struct usb_serial_port *port, return 0; } -static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) -{ - struct ssu100_port_private *priv = usb_get_serial_port_data(port); - struct async_icount prev, cur; - unsigned long flags; - - spin_lock_irqsave(&priv->status_lock, flags); - prev = port->icount; - spin_unlock_irqrestore(&priv->status_lock, flags); - - while (1) { - wait_event_interruptible(port->delta_msr_wait, - (port->serial->disconnected || - (port->icount.rng != prev.rng) || - (port->icount.dsr != prev.dsr) || - (port->icount.dcd != prev.dcd) || - (port->icount.cts != prev.cts))); - - if (signal_pending(current)) - return -ERESTARTSYS; - - if (port->serial->disconnected) - return -EIO; - - spin_lock_irqsave(&priv->status_lock, flags); - cur = port->icount; - spin_unlock_irqrestore(&priv->status_lock, flags); - - if ((prev.rng == cur.rng) && - (prev.dsr == cur.dsr) && - (prev.dcd == cur.dcd) && - (prev.cts == cur.cts)) - return -EIO; - - if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) || - (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) || - (arg & TIOCM_CD && (prev.dcd != cur.dcd)) || - (arg & TIOCM_CTS && (prev.cts != cur.cts))) - return 0; - } - return 0; -} - static int ssu100_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { @@ -391,10 +348,6 @@ static int ssu100_ioctl(struct tty_struct *tty, case TIOCGSERIAL: return get_serial_info(port, (struct serial_struct __user *) arg); - - case TIOCMIWAIT: - return wait_modem_info(port, arg); - default: break; } @@ -509,7 +462,7 @@ static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) port->icount.dcd++; if (msr & UART_MSR_TERI) port->icount.rng++; - wake_up_interruptible(&port->delta_msr_wait); + wake_up_interruptible(&port->port.delta_msr_wait); } } @@ -607,6 +560,7 @@ static struct usb_serial_driver ssu100_device = { .process_read_urb = ssu100_process_read_urb, .tiocmget = ssu100_tiocmget, .tiocmset = ssu100_tiocmset, + .tiocmiwait = usb_serial_generic_tiocmiwait, .get_icount = usb_serial_generic_get_icount, .ioctl = ssu100_ioctl, .set_termios = ssu100_set_termios, -- cgit v1.2.3